Expansion-anchor-shell drill



March 22,1927. 1,621,598 I J. H. PHILLIPS EXPANSION ANCHOR SHELL DRILL Filed Jan.15, 1923 M H h was??? \7o6/ 7%70 50 M m 45 6;, M4;

Patent d? Mir. 1927;

'a n u m a-ra nary is, 192:. swarm, 612,854..

My invention belongs to that-general class of devices known. as stone-edrills or thelike, and relates particularlyto a hollow shell or core type of drill,;so constructed as to drill a bell-shapedv hole, and, at the completion of the drillingoperation, be lockedagamst; withdrawalfrom the hole.

Anchor or expansion shells are largely used, on ceilings, walls, etc., of concrete,

'brick, stone and like material, for the suprt of pi e andwire systems and mechanlcal, electrical andotherequr ment. W th my construction herein descri edthe same is adapted to notonly drill the hole, but,

at the completion ofthe drilling operation, the same is ositively locked against withdrawal, there y prov1ding.a support for the i attachment of any suitable article or ap- 'drill' showing the ex ander and locking paratus which may be desired.

The invention has. among its objects the production of a device of the kind described that is simple, inexpansive, durable, eflicient, compact and satisfactory for use wherever found a plicable. It has particularly as an object t e production of a device whlclrwill.

be positively and rigidly attached to the.

desired body in which the same is to be seated, and whichwill drill a hole of the exact size to fit the device with the minimum of efiort. It also has as an object the production of a device which will be economical to use and which may be inexpensively manufactured.

' Many other objects and advantages of the.

construction herein shown and described will be obvious to those skilled in the art from the disclosures herein given.

To this end my invention consists in the novel construction, arrangement and combination of parts herein shown and described, and more particularly pointed out in the characters parts Fig. 1 is a view in indicate like or corresponding elevation of a drill with the body to be drilled shown in section and illustrating a step in the drilling operation' Fig. 2 is a sectional view through" the member in elevation ilustrating a further etc]? in the operation;

ig. 3 is a sectional view of theysame, showmg the-drill substantlally seated and serving asan anchoring device;

ticulartype illustrated Fig.- 4;: is a similar view illustrating a sllglitlydiiferent "arrangement of; fastener;

Frg,,5"is,-a perspective view of. the shell; 1g; 6.18. a; section therethrough,taken substantially on line 6-6 of Fig. 5; and

sty e at one end, which maybe termed the drilling end. The opposite end is constructed in the desired manner to fit a suitable chuck, the particular construction depending upon the type of chuck to be used. As shown in the drawings, the same is taembodiments of the invention are or opening 2. through the same, with cutting edges, teeth or faces 3 of the desired pered as at 18 so. as to seat in a chuck 7 (shown in dotted lines in Fig. 1), which chuck may be operated in any suitable manner, as for example by a percussion hammer or drill device or the rotary ty e of. drill device, or in the case of smal work,- by handdrill or by a brace. The same is constructed to borea hole6 in the material 5, which may be of stone, brick, concrete or the like. a s The drilling end of the shell is preferably arranged for expansion, and this may be constructed by cutting slots or weakening the same by grooving, or by making the drill in a plurality of parts. In the parin the drawings, the drill is rovided with grooves 4 adjacent the drilling end,,so that the same may be easily fractured thereat when expanded, but will not expand during a drilling operation a without providing expanding means at a further step in the operation.

After the hole 6 has been drilled to the desired depth, the drill is preferably removed from thehole, and an ex anding or lockin member 8 inserted in t e drilling end o the-same, and the drill, with the expandmg member in place, reinserted in the hole. The expanding member is preferably suitably the shell or the material to be drilled and of a size to closely fit the hole and may be tapered, substantially as shown. in the draw-i ings, so that the same has a tendency to be self-centering in case the drilland expander hardened so as to be harder than should become separated during the insertion or drilling operation, as might be the case where percussion hammer or drill is em loyed for drilling pur oses.

be hole is then re-dri ed as before, or the drill may be forced into place or struck fhome with a hammer. When, however, the hole is redrilled with the expander in place,

circumference with the wa l of the hole, butthe end of the shell is oflset or flared, as indicated at 3' in Fig.- 3, thereby affording a positive grip on the wall of the hole where it is enlarged. The extent to which the hole may be enlarged and the shell expanded depends of course, upon the preference of the user and the construction of the parts.

The shell ma be made in one or more parts and slotte as illustrated in Fig. 7 or, as shown, in Figs. 1 to 6, the shell may be grooved to provide for the expansion. Ordinaril the grooving is preferred in a drill of t e type shown, as the unfractured material tends to prevent expansion or contraction during the first drilling operation,

as illustrated in Fig. 1, but permits uniform fracturing of the parts when expanded by the hardened plug or expander, as shown in Fig. 3. y

In the device shown in Fig. 3, the expanding member 8 is provided with an internally threaded bore arranged to cooperate with the threads of a bolt or screw 10 having a head 11 for engagement with the work or article to be supported or held in lace. I have shown'in Figs. 2 and 3 an 1nternal thread 2 on the interior of the shell. This, however, is unnecessary where a bolt similar to that shown in Fig. 3 is employed. Obviously in the construction in Fig. 3 securing the work in place tends to also hold the expander in close engagement with the shell.

In the type of device illustrated in Fig. 4, the shell is similar to that previously described and the expander 15 is similar to the expander 8, except that it need not have a threaded bore therethrough. In this case, however, a threaded screw 16, provided with a head 17, or the equivalent, threads directly into the shell and supports the work. This construction is particularly desirable for light work and has been found especially adapted for use where the shell is to be seated in marble or the like.

The shells shown may be constructed of an integral tube or ipe, or the same may be constructed 'of a b ank of metal, the same being punched or cut with the cutting teeth and with the dgrooves or slots as previously described, an then rolled in the form of a tube, and thence case-hardened ortreated to make the same more efficient. The same, however, may be formed in any other suitable manner'by punching and case-hardening or the like, this method being merely Slig esgi-ve of how the same may be accomp is e It will be noted that in all of the devices shown, the bell-shaped hole is cut or drilled and the drill expanded in the hole during the operation, thereby forming a permanently-set anchor shell which will have great strength and rigidity and will carry any load u to the strength of the material of the b0 y.

Having thus described my invention, it is obvious that various immaterial modifications may be made in the same without departing from the spirit of my invention;

ence I do not wish to be understood as limiting myself to the exact form, construction, arrangement and combination of parts herein shown and described, or uses mentioned.

What I claim as new and desire to secure by Letters Patent is:

1. A Self-drilling expansion anchor shell consisting of a shell body-part constructed for expansion at its cutting end,'and means for expanding the same thereat during a drilling operation and maintaining the same expanded, whereby said shell is locked against withdrawal in the drilled hole.

2. An anchoring device comprising a combined drilling and anchoring shell and atapering expander and locking member therefor, said expander and locking member operative to control the drill during a drilling operation to increase the size of the hole at the bottom and operative at the completion of the drilling operation to positively lock the shell against withdrawal from within the hole.

3. In an anchoring device and in combination, a tubular combined drillin and anchoring member expansible at its cutting end, and means insertable into said member at said cutting end for expanding the same thereat durin a drilling operation there with and locking the same in thehole.

4:. In an anchoring device and in combination, a tubular combined drilling and anchoring member expansible along predetermined lines at its cutting end, and means insertable into said member at said cutting end for expanding the same thereat during a drilling operation therewith and locking the same in the hole.

5. In a device of the kind described and simultaneously with the drilling operation thereof.

6. In a device of the kind described and in combination, a drill shell having cutting teeth at one end, said cutting endbeing weakened along a, plurality of circumferentially spaced longitudinally extending lines so as to be expansible, and means insertable into said weakened end for fracturing and expanding the same thereat simultaneously with the drilling operation thereof.

7 Ina device of the kind described and in combination, a drill shell having a cutting edge at one end, a longitudinal recess in said shell at its cutting end to weaken it so as to be radially expansible thereat, and

means insertableinto said weakened end for fracturing and expanding it thereat during the drilling operation.

8. In a device of the kind described and in combination, a drill shell having a longitudinally externally grooved expansible cutting end, and tapered means extending into said shell and insertable into the bottom of the hole into which the shell is to be inserted and bearing outwardly against said grooved cutting end for fracturing and expanding said shell thereat during the drilling operation thereof.

9. In an anchoring device and in-combination, a combined drilling and anchoring shell having a weakened ,expansible cutting end, and a tapered expander and locking member insertable thereinto, said expander and lockin member'- having a maximum diameter su stantially equal to the diameter of the hole into which the shell is inserted for fracturing the weakened end of the shell and gradually expanding it thereat during in concrete and like bodies, consisting in drilling a straight sided hole in the body, positioning an expander in the bottom of said hole, and thence redrilling the hole at the bottom to increase the diameter of the hole and the drill thereat and simultaneously locking the drill in the hole against withdrawal from the body.

In testimony whereof, I have hereunto signed my name.

JOHN H. PHILLIPS. 

